Viking has wisely decided not to publish this fascinating novel as a mystery, as it was designated in Canada, where it earned excellent reviews. While two (rather bland) mysteries animate the plot, the book's considerable impact is as a combination of psychological novel and satirical comedy of manners that wittily dissects the pretensions of academia. The titular Mary Swann was murdered on the very day she had shown her poems to a publisher who recognized her talent. Fifteen years after her death, a symposium is to take place; the story focuses on four people who will attend: a ferociously engagee feminist scholar who ``rediscovered'' Swann's poetry, a misanthropic biographer committed to writing about Swann, a silly spinster librarian in the tiny town near Swann's home and the gruff but kindly publisher who issued her works in a limited edition. Each commands a section of the narrative and, in cool, witty prose, Shields artfully conveys their personalities, as well as the distortions each has made, for their own reasons, in Swann's life and work. (Meanwhile, however, a thief is systematically stealing every extant copy of her book.) In the end, Swann's life remains unknowable, though by now completely altered by her devotees' speculation and obfuscation. Adroitly illuminating the chasm between appearance and reality, this intelligent, provocative novel is sure to pique readers' interest in Shields's earlier work, Various Miracles , just reissued by Penguin. (July)